Semi-closed impeller of pump

Abstract

A semi-closed impeller of a pump comprises a rear cover plate and blades arranged on the rear cover plate. A front cover plate is arranged on the upper portions of the blades and partially covers an impeller consisting of the blades, and after the rear cover plate, the blades and the front cover plate are combined, a material conveying channel with the closed upper portion and the semi-closed lower portion is formed; and the blades can be seen from an inlet of the material conveying channel with the closed upper portion and the semi-closed lower portion. The semi-closed impeller has characteristics of an opened impeller and characteristics of a semi-opened impeller, when materials are insufficient, the impeller still can work normally, and the semi-closed impeller further has the advantage of high efficiency of a closed impeller. The semi-closed impeller is applicable to a foam slurry pump and a submerged slurry pump; and the foam slurry pump and the submerged slurry pump are widely used for enterprises of metallurgy, mines, coal, electric power, chemical engineering and the like, and have a remarkable energy saving effect when provided with the semi-closed impeller.

Description

technical field [0001] The invention relates to an impeller of a centrifugal pump, in particular to an impeller of a foam slurry pump for transporting a solid-liquid-gas mixture and an underwater slurry pump for transporting a solid-liquid mixture. Background technique [0002] There are three types of geometric shapes of existing centrifugal pump impellers, including open impeller, semi-open impeller and closed impeller (see "Modern Pump Design Manual" P12--Written by Guan Xingfan) [0003] In the field of slurry pumps, semi-open impellers and closed impellers are mainly used. figure 1 As shown, the structure of a semi-open impeller is given. The semi-open impeller includes a rear cover and blades arranged on the rear cover. After the combination of the rear cover and the blades, the upper part is open and the lower part is Closed material conveying channel; the advantage of this semi-open impeller is that it can still work normally when the incoming material is insufficie...

AI Technical Summary

Problems solved by technology

[0003] In the field of slurry pumps, semi-open impellers and closed impellers are mainly used. figure 1 As shown, the structure of a semi-open impeller is given. The semi-open impeller includes a rear cover and blades arranged on the rear cover. After the combination of the rear cover and the blades, the upper part is open and the lower part is Closed material conveying channel; the advantage of this semi-open impeller is that it can still work normally when the incoming material is insufficient, but its working efficiency is low; figure 2 As shown, a structure of a closed impeller is given. The closed impeller includes a rear cover and blades arranged on the rear cover. The upper part of the blade is provided with a front cover, and the front cover covers the whole The impeller is composed of blades, and the combination of the rear cover, blades and front cover forms a closed material conveying channel at the upper and lower parts; this closed impeller has the advantage of relatively high efficiency, but it is subject to Restricted by objective factors of insufficient material, its efficiency is still difficult to achieve the ideal state

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